#!/usr/bin/env python3

from collections import Counter
from functools import reduce

# 1

with open("day01") as f:
  lines = f.readlines()

els = [l.split() for l in lines]
l1 = [int(el[0]) for el in els]
l2 = [int(el[1]) for el in els]

l1.sort()
l2.sort()

d = [abs(e[0] - e[1]) for e in zip(l1, l2)]
res = sum(d)


# 2
ctn = Counter(l2)
res = reduce(lambda accum, e: accum + e*ctn.get(e, 0), l1, 0)